BUG: fix for 3550 again

Modules/CMakeCommonLanguageInclude.cmake

@@ -20,7 +20,7 @@ IF(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
   SET (CMAKE_EXE_LINKER_FLAGS_MINSIZEREL ${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL_INIT} CACHE STRING
      "Flags used by the linker during release minsize builds.")
 
-  SET (CMAKE_EXE_LINKER_FLAGS_RELEASE ${CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT} "" CACHE STRING
+  SET (CMAKE_EXE_LINKER_FLAGS_RELEASE ${CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT} CACHE STRING
      "Flags used by the linker during release builds.")
 
   SET (CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO 
@@ -34,7 +34,7 @@ IF(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
      CACHE STRING
      "Flags used by the linker during release minsize builds.")
 
-  SET (CMAKE_SHARED_LINKER_FLAGS_RELEASE ${CMAKE_SHARED_LINKER_FLAGS_RELEASE_INIT} "" CACHE STRING
+  SET (CMAKE_SHARED_LINKER_FLAGS_RELEASE ${CMAKE_SHARED_LINKER_FLAGS_RELEASE_INIT} CACHE STRING
      "Flags used by the linker during release builds.")
 
   SET (CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO 
@@ -48,7 +48,7 @@ IF(NOT CMAKE_NOT_USING_CONFIG_FLAGS)
      CACHE STRING
      "Flags used by the linker during release minsize builds.")
 
-  SET (CMAKE_MODULE_LINKER_FLAGS_RELEASE ${CMAKE_MODULE_LINKER_FLAGS_RELEASE_INIT} "" CACHE STRING
+  SET (CMAKE_MODULE_LINKER_FLAGS_RELEASE ${CMAKE_MODULE_LINKER_FLAGS_RELEASE_INIT} CACHE STRING
      "Flags used by the linker during release builds.")
 
   SET (CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO